Limits of Cinnamon Notification Controls for Update Manager Alerts in Linux Mint

Goal: Keep critical security update notifications from Update Manager visible while muting routine, low‑priority alerts that contribute to notification noise.

Constraints: Linux Mint Cinnamon offers per‑application enable/disable toggles and a global Do Not Disturb switch, but Update Manager’s preferences only let you adjust check frequency and enable/disable all notifications; there is no built‑in option to filter by update level or to set quiet hours.

Specific questions: Can Update Manager be configured to show only security‑level alerts while hiding lower‑level ones? Is there a way to schedule quiet hours for Update Manager without disabling the tray icon? Does enabling Do Not Disturb allow per‑application exceptions for mintupdate?